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Estimation of Chlorine in Household Bleach In this investigation, I am looking to determine the amount of chlorine present in household bleach. However, in order to do this I would have to calculate the mass represented by chlorine in the mass of the household bleach. After doing that, I would then have to represent this as a percentage. In order to calculate the mass represented by the chlorine in the mass of the household bleach, I would have to titrate this solution, along with an excess of potassium iodide and ethanoic acid against sodium thiosulphate from the burette using starch solution as an indicator. The reason for this choice of indicator is that iodine is turned blue black by the starch solution, and this therefore helps to indicate any colour change that occurs. I began my investigation by measuring out 10mls of household bleach using a measuring cylinder. I poured this into...

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